Splined sun gear and method for compact electro-mechanical transmission
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United States of America Patent
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Mar 27, 2007
Grant Date -
Sep 22, 2005
app pub date -
Dec 16, 2004
filing date -
Mar 22, 2004
priority date (Note) -
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Abstract
This invention relates to a sun gear member and sun gear shaft providing improved manufacturing time and material cost savings. This invention further relates to the packaging of a compact electro-mechanical transmission specifically as it pertains to the redesign of the planetary gear arrangement to compensate for the new design of the sun gear member and sun gear shaft. Several design modifications are disclosed in order to reduce the diameter of the planetary gear arrangement and its inclusive members. For example, the ring gear is chamfered to allow for additional clearance so that the planetary gear arrangement and the electronic motor package can be more compact when sun gear has separable sun gear members. In addition to packaging considerations, material costs, fatigue life requirements, and manufacturability of relevant transmission components were governing concerns in the redesign of the sun gear member and sun gear shaft.
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